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Ordered states in the disordered Hubbard model

Author

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  • Denteneer, P.J.H
  • Ulmke, M
  • Scalettar, R.T
  • Zimanyi, G.T

Abstract

The Hubbard model is studied in which disorder is introduced by putting the on-site interaction to zero on a fraction f of (impurity) sites of a square lattice. Using quantum Monte Carlo methods and dynamical mean-field theory we find that antiferromagnetic long-range order is initially enhanced at half-filling and stabilized off half-filling by the disorder. The Mott–Hubbard charge gap of the pure system is broken up into two pieces by the disorder: one incompressible state remains at average density n=1 and another can be seen slightly below n=1+f. Qualitative explanations are provided.

Suggested Citation

  • Denteneer, P.J.H & Ulmke, M & Scalettar, R.T & Zimanyi, G.T, 1998. "Ordered states in the disordered Hubbard model," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 251(1), pages 162-178.
    • Handle: RePEc:eee:phsmap:v:251:y:1998:i:1:p:162-178
    DOI: 10.1016/S0378-4371(97)00602-X
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